Reorganize repo: one folder per application under apps/.

Move docker/ and configs/ into apps/<name>/ with config/ subfolders.
Proxmox split into hosts/pve and hosts/dell-proxmox. Nginx under
infrastructure/. Update sync script, RESTORE.md, and per-app READMEs.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/proxmox/hosts/dell-proxmox/qemu-server/102.conf

@@ -0,0 +1,15 @@
+boot: order=scsi0;ide2;net0
+cores: 2
+cpu: x86-64-v2-AES
+ide2: local:iso/ubuntu-24.04.4-live-server-amd64.iso,media=cdrom,size=3325654K
+memory: 4096
+meta: creation-qemu=9.2.0,ctime=1773264068
+name: Postgress
+net0: virtio=BC:24:11:A0:94:13,bridge=vmbr0,firewall=1
+numa: 0
+ostype: l26
+scsi0: local-lvm:vm-102-disk-0,iothread=1,size=64G
+scsihw: virtio-scsi-single
+smbios1: uuid=c31ed9ab-a01e-4ef2-bcc1-3bab6ea7e97f
+sockets: 1
+vmgenid: 355531b3-df61-44d5-b598-8c2f2da1ad73